| Message ID | 20240705170210.3236-1-jszhang@kernel.org (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | [v2] riscv: define ILLEGAL_POINTER_VALUE for 64bit | expand |
On Sat, Jul 06, 2024 at 01:02:10AM +0800, Jisheng Zhang wrote: > This is used in poison.h for poison pointer offset. Based on current > SV39, SV48 and SV57 vm layout, 0xdead000000000000 is a proper value > that is not mappable, this can avoid potentially turning an oops to > an expolit. Maybe I also need to cc stable? This is a secure hole fix patch. > > Signed-off-by: Jisheng Zhang <jszhang@kernel.org> > --- > > Since v1: > - fix typo:s/SV59/SV57 > > arch/riscv/Kconfig | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig > index c51b32a8ddff..c992eabbd002 100644 > --- a/arch/riscv/Kconfig > +++ b/arch/riscv/Kconfig > @@ -313,6 +313,11 @@ config GENERIC_HWEIGHT > config FIX_EARLYCON_MEM > def_bool MMU > > +config ILLEGAL_POINTER_VALUE > + hex > + default 0 if 32BIT > + default 0xdead000000000000 if 64BIT > + > config PGTABLE_LEVELS > int > default 5 if 64BIT > -- > 2.43.0 > > > _______________________________________________ > linux-riscv mailing list > linux-riscv@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-riscv
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index c51b32a8ddff..c992eabbd002 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -313,6 +313,11 @@ config GENERIC_HWEIGHT config FIX_EARLYCON_MEM def_bool MMU +config ILLEGAL_POINTER_VALUE + hex + default 0 if 32BIT + default 0xdead000000000000 if 64BIT + config PGTABLE_LEVELS int default 5 if 64BIT
This is used in poison.h for poison pointer offset. Based on current SV39, SV48 and SV57 vm layout, 0xdead000000000000 is a proper value that is not mappable, this can avoid potentially turning an oops to an expolit. Signed-off-by: Jisheng Zhang <jszhang@kernel.org> --- Since v1: - fix typo:s/SV59/SV57 arch/riscv/Kconfig | 5 +++++ 1 file changed, 5 insertions(+)